<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
			body,html{
				height: 100%;
				margin: 0px;
			}
			.wrap{
				width: 400px;
				height: 400px;
				border: 2px solid lightblue;
				margin: 100px auto;
                animation: 3s xuanzhuan infinite linear;
			}
			.gre{
				width: 50px;
				height: 50px;
				border-radius: 50%;
				background-color: green;
				margin: -25px;
			}
			.red{
				width: 250px;
				height: 250px;
				border-radius: 50%;
				background-color: red;
				margin: -425px auto;
			}
			@keyframes xuanzhuan{
				0%{
					transform: rotate(0deg);
				}
				100%{
					transform: rotate(360deg);
				}
			}
			
		</style>
	</head>
	<body>
		<div class="wrap">
			<div class="gre"></div>
		</div>
		<div class="red"></div>
	</body>
</html>
